Well, sims are essentially two-dimensional anyway. Their bodies often intersect nearby objects as well as each-other. The underlying structure of the game, both in terms of environment and ai is way simpler than the sims' seeming depth suggests. a massive amount of what happens in the sims happens 100% between the gamer's ears.

No, I mean a universe where the laws of physics are just slightly different from our own, and where not only can plutonium 186 exist, but it is stable and non-radioactive and irridium 186 decays into plutonium 186.